/**
 * 
 */
package simpleFactory;

/**
 * @author sz
 *
 * create time：2012-7-31
 */
public class OperationSub extends Operation{

	@Override
	public double GetResult(){
		
		double result = 0;
		
		result = getNumberA() - getNumberB();
		
		return result;
	}
}
